[Nexus 6P Android Development] npjohnson:
TLDR:

This project is no longer actively maintained, see explanation here.

1: MAKE A BACKUP. Seriously.

2: Downloads in second post. Flash recovery, then kernel, then MultiROM.

3: Any issues: please report at https://github.com/multirom-nexus6p/multirom/issues I won't be reading this thread very often.

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Introduction

This is a port of Tassadar's MultiROM, a multi-boot mod for Nexus 6P. The main part of MultiROM is a boot manager, which appears every time your device starts and lets you choose ROM to boot. You can see how it looks on the left image below and in gallery. ROMs are installed and managed via modified TWRP recovery. You can use standard ZIP files to install secondary Android ROMs and MultiROM even has its own installer system, which can be used to ship other Linux-based systems.

This is still very experimental!

This has been thoroughly tested with the most popular ROM's for the 6P.

Make backups. Seriously. Please.

Features:

* Multiboot any number of Android ROMs

* Restore nandroid backup as secondary ROM

* Boot from USB drive attached via USB-C OTG cable

Warning!

It _is_ dangerous. This whole thing is basically one giant hack - none of these systems are made with multibooting in mind. It is no longer messing with data partition or boot sector, but it is possible that something goes wrong and you will have to flash factory images again. Make backups. Always.​

Installation

We have a custom built MultiROM Manager .apk in the downloads section, feel free to try it! (somewhat untested, please report, even if install doesn't work, ROM name customization, etc. should work fine)

1. Via MultiROM Manager app

This is the easiest way to install everything MultiROM needs. Install the app found in the next post, and select MultiROM and recovery on the Install/Update card. If the Status card says Kernel: doesn't have kexec-hardboot patch! in red letters, you have to install also patched kernel - either select one on the Install/Update card or get some 3rd-party kernel here on XDA. You are chosing kernel for your primary ROM, not any of your (future) secondary ROMs, so select the version accordingly.

Press "Install" on the Install/Update card to start the installation.

Accept any Super User request prompts.
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2.Manual installation

Firstly, there are videos on youtube. If you want, just search for "MultiROM installation" on youtube and watch those, big thanks to all who made them. There is also an awesome article on Linux Journal.

MultiROM has 3 parts you need to install:

Modified recovery (TWRP_multirom_angler_YYYYMMDD.img) - download the IMG file from second post and use fastboot to flash it.

Patched kernel - You can use either one of the stock ones in second post or third-party kernels which include the patch, you can see list in the second post. Download the ZIP file and flash it in recovery.

MultiROM (multirom-YYYYMMDD-vXX-angler.zip) - download the ZIP file from second post and flash it in recovery.

Your current rom will not be erased by the installation.​

Adding ROMs

1. Android

Go to recovery, select MultiROM -> Add ROM. Select the ROM's zip file and confirm.​

Using USB drive

During installation, recovery lets you select install location. Plug in the USB drive, wait a while and press "refresh" so that it shows partitions on the USB drive. You just select the location (extX, NTFS and FAT32 partitions are supported) and proceed with the installation.

If you wanna use other than default FAT32 partition, just format it in PC. If you don't know how/don't know where to find out how, you probably should not try installing MultiROM.

If you are installing to NTFS or FAT32 partition, recovery asks you to set image size for all the partitions - this cannot be easilly changed afterward, so choose carefully. FAT32 is limited to maximum of 4095MB per image - it is limitation of the filesystem, I can do nothing about that.

Installation to USB drives takes a bit longer, because the flash drive is (usually) slower and it needs to create the images, so installation of Ubuntu to 4Gb image on my pretty fast USB drive takes about 20 minutes.

Enumerating USB drive can take a while in MultiROM menu, so when you press the "USB" button in MultiROM, wait a while (max. 30-45s) until it searches the USB drive. It does it by itself, no need to press something, just wait.​

Updating/changing ROMs

1. Primary ROM (Internal)

Flash ROM's ZIP file as usual, do factory reset if needed (it won't erase secondary ROMs)

Go to Advanced -> MultiROM in recovery and do Inject curr. boot sector.

2. Secondary Android ROMs

If you want to change the ROM, delete it and add new one. To update ROM, follow these steps:

Go to Advanced -> MultiROM -> List ROMs and select the ROM you want to update.

Select "Flash ZIP" and flash ROM's ZIP file.

Note that swapping roms between internal and external is not supported (yet). Also, after flashing a factory image to the primary system and boot partition, make sure to immediately inject MultiROM before first boot, otherwise the secondary ROMs will be deleted.

Source code

MultiROM - https://github.com/multirom-nexus6p/multirom/tree/master (branch master)

Modified TWRP - https://github.com/multirom-nexus6p/Team-Win-Recovery-Project (branch android-6.0) -- Includes the awesome new Material Dark TWRP theme by @daveyannihilation ! Go thank him, or get his Blackout Domination Layers or CMTE (yes, there are free versions on the Play Store, but you can find those yourself, or donate to a hard worker :) ).

Kernel w/ kexec-hardboot patch - https://github.com/multirom-nexus6p/android_kernel_huawei_angler/tree/mm -- use angler_defconfig

Device tree: https://github.com/multirom-nexus6p/TWRP-android_device_huawei_angler/tree/android-6.0-mrom
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Thanks

This port is based on the hard work of Tassadar, 500 Internal Server Error, Geoff Levand, webgeek1234, Mike Kasick, Npjohnson, Hashbang173, and many others. Thank you.

Issues

- None that are known. If you find one that this thread does not know about/hasn't answered (solid rule, read the last three pages of the thread befre reporting an issue), report it on the specific repo in question here.

- IF YOU GET LOCKED OUT OF YOUR DEVICE: Don't worry! Your data is fine. Simply boot to TWRP, choose 'Advanced' ==> 'Terminal Command' ==> type "rm -Rf /data/system/gatekeeper.*.key" (without the quotes). This is a dirty fix, and should only be used to recover data, not as a permanent solution! After you recover your data, wipe /data (you don't have to wipe Internal Storage), and re-setup the device.

Please report any unlisted issues to the GitHub bug tracker at https://github.com/multirom-nexus6p/multirom/issues . You'll get faster response if you post there instead of in this thread

Changelog

Here

Downloads

Downloads

v33 -- Stable 7:

MR Installer App: Play Store Link

MR-TWRP: mr-twrp-recovery-20160528-05-STABLE7.img

MultiROM Installer Flashable ZIP: multirom-20160514-v33-UNOFFICIAL-angler-STABLE7.zip

Stock HardBoot Enabled Kernel Flashable ZIP (only your Primary ROM needs this): kernel-hardboot-stock-angler-6.0.1-20160514

MultiROM Uninstaller Flashable ZIP: multirom_uninstaller.zip

NOTE:

Third party kernels with kexec-hardboot support (can be flashed to primary ROM):

ElementalX

FrancoKernel

AK

PureNexus

(Alert me if I've missed any!)

Extra Information

Unlike some of the other 64-bit MultiROM ports, this port does have kexec-hardboot enabled, which is less risky and speeds up boot into secondary ROM. Anyone porting MultiROM to a Snapdragon 810 device may find the source to be useful. The patch was written by [MENTION=5924703]500 Internal Server Error[/MENTION]

Also, due to recent events on other projects of mine, you are welcome to fork our Github repositories, and use them to port MR to new devices, and as a reference, but, I ask that no one build targeting the 6P using our source and post it publicly (of course you can build for personal use, but distribution is forbidden). Of course, I welcome and ask that anyone who wants to pull request changes in to do so!

The only acceptable releases based on our source for the 6P is recovery/multirom themes, though, I strongly ask you tag me so I can note the themed version in the OP.

XDA:DevDB Information

MultiROM for Nexus 6P, Tool/Utility for the Huawei Nexus 6P

Contributors

npjohnson, 500 Internal Server Error

Source Code: https://github.com/multirom-nexus6p/

Version Information

Status: No Longer Updated

Current Stable Version: v33-05282016-STABLE7

Stable Release Date: 2016-05-28

Created 2016-02-12

Last Updated 2017-09-17